Deferred Charges and Other Assets, net - Schedule of deferred charges and other assets, net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Leasing	$ 203,533		$ 226,885
Intangible assets:
In-place lease values	87,776		94,966
Leasing commissions and legal costs	22,301		23,508
Above-market leases	65,195		140,889
Deferred tax assets	31,851		32,197
Deferred compensation plan assets	50,244		45,857
Other assets	59,295		75,497
Deferred charges and other assets, gross	520,195		639,799
Less accumulated amortization	(212,528)		(249,396)
Deferred charges and other assets, net	307,667		390,403
In-place lease values, leasing commissions and legal costs
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization for intangible assets	67,094		$ 72,286
Amortization expense for intangible assets	$ 3,205	$ 3,835